What's amazing about the silver fox domestication experiment was that it used ONE selection criteria - flight distance (the distance a human can approach an ani

What's amazing about the silver fox domestication experiment was that it used ONE selection criteria - flight distance (the distance a human can approach an animal before it runs away) to do selective breeding. After tens of generations, the foxes were domesticated and most of the traits of a domesticated animals such as cuteness came along as side effects. It was a great experiment showing a simple selection rule can generate complex evolution result.